Re: [Boost-users] [boost] [chrono] v0.4.1 + thread_clock implementation on Windows

Subject: Re: [Boost-users] [boost] [chrono] v0.4.1 + thread_clock implementation on Windows
From: vicente.botet (vicente.botet_at_[hidden])
Date: 2010-06-20 07:22:23

----- Original Message ----- 
From: "joel falcou" <joel.falcou_at_[hidden]>
To: <boost-users_at_[hidden]>
Sent: Sunday, June 20, 2010 12:10 PM
Subject: Re: [Boost-users] [boost] [chrono] v0.4.1 + thread_clock implementation on Windows

> 
> vicente.botet wrote:
>> What do you mean by a "real MPL arithmetic types " I'm aware of mpl integral constants, but I don't know other that can be used as arithmetic constants. What a re the requirements for these MPL arithmetic types? Could you elaborate?
>>   
> MPL arithmetic types should model the MPL Integral Constant concepts as 
> specified here:
> 
> http://www.boost.org/doc/libs/1_43_0/libs/mpl/doc/refmanual/integral-constant.html
> 
> the idea is just to have your rational type being usable like:
> 
> boost::mpl::plus<R1,R2>::type
> 
> instead of using ratio_plus etc...

Joel, arithmetic and integral are not the same thing for me. I don't see how I can make ratio be a model of a MPL Integral constant as ratio is not integral, value_type can not be defined, there is no next, nor prior. Am I missing something?

Are you suggesting that I write an specialization of boost::mpl::plus for ratio?

Thanks,
Vicente